RT Journal Article SR Electronic T1 Certain points in the estimation of barium as the sulphate JF American Journal of Science JO Am J Sci FD American Journal of Science SP 288 OP 295 DO 10.2475/ajs.s3-41.244.288 VO s3-41 IS 244 A1 F. W. Mar YR 1891 UL http://www.ajsonline.org/content/s3-41/244/288.abstract AB